/*
 * Copyright (c) 2010, Google, Inc.
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/**
 * @file
 * VP8/9 encoder support via libvpx
 */

#define VPX_DISABLE_CTRL_TYPECHECKS 1
#define VPX_CODEC_DISABLE_COMPAT    1
#include <vpx/vpx_encoder.h>
#include <vpx/vp8cx.h>

#include "avcodec.h"
#include "internal.h"
#include "libavutil/avassert.h"
#include "libvpx.h"
#include "packet_internal.h"
#include "profiles.h"
#include "libavutil/avstring.h"
#include "libavutil/base64.h"
#include "libavutil/common.h"
#include "libavutil/internal.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/mathematics.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"

/**
 * Portion of struct vpx_codec_cx_pkt from vpx_encoder.h.
 * One encoded frame returned from the library.
 */
struct FrameListData {
    void *buf;                       /**< compressed data buffer */
    size_t sz;                       /**< length of compressed data */
    void *buf_alpha;
    size_t sz_alpha;
    int64_t pts;                     /**< time stamp to show frame
                                          (in timebase units) */
    unsigned long duration;          /**< duration to show frame
                                          (in timebase units) */
    uint32_t flags;                  /**< flags for this frame */
    uint64_t sse[4];
    int have_sse;                    /**< true if we have pending sse[] */
    uint64_t frame_number;
    struct FrameListData *next;
};

typedef struct VPxEncoderContext {
    AVClass *class;
    struct vpx_codec_ctx encoder;
    struct vpx_image rawimg;
    struct vpx_codec_ctx encoder_alpha;
    struct vpx_image rawimg_alpha;
    uint8_t is_alpha;
    struct vpx_fixed_buf twopass_stats;
    int deadline; //i.e., RT/GOOD/BEST
    uint64_t sse[4];
    int have_sse; /**< true if we have pending sse[] */
    uint64_t frame_number;
    struct FrameListData *coded_frame_list;

    int cpu_used;
    int sharpness;
    /**
     * VP8 specific flags, see VP8F_* below.
     */
    int flags;
#define VP8F_ERROR_RESILIENT 0x00000001 ///< Enable measures appropriate for streaming over lossy links
#define VP8F_AUTO_ALT_REF    0x00000002 ///< Enable automatic alternate reference frame generation

    int auto_alt_ref;

    int arnr_max_frames;
    int arnr_strength;
    int arnr_type;

    int tune;

    int lag_in_frames;
    int error_resilient;
    int crf;
    int static_thresh;
    int max_intra_rate;
    int rc_undershoot_pct;
    int rc_overshoot_pct;

    AVDictionary *vpx_ts_parameters;
    int *ts_layer_flags;
    int current_temporal_idx;

    // VP9-only
    int lossless;
    int tile_columns;
    int tile_rows;
    int frame_parallel;
    int aq_mode;
    int drop_threshold;
    int noise_sensitivity;
    int vpx_cs;
    float level;
    int row_mt;
    int tune_content;
    int corpus_complexity;
    int tpl_model;
    /**
     * If the driver does not support ROI then warn the first time we
     * encounter a frame with ROI side data.
     */
    int roi_warned;
} VPxContext;

/** String mappings for enum vp8e_enc_control_id */
static const char *const ctlidstr[] = {
    [VP8E_SET_CPUUSED]           = "VP8E_SET_CPUUSED",
    [VP8E_SET_ENABLEAUTOALTREF]  = "VP8E_SET_ENABLEAUTOALTREF",
    [VP8E_SET_NOISE_SENSITIVITY] = "VP8E_SET_NOISE_SENSITIVITY",
    [VP8E_SET_STATIC_THRESHOLD]  = "VP8E_SET_STATIC_THRESHOLD",
    [VP8E_SET_TOKEN_PARTITIONS]  = "VP8E_SET_TOKEN_PARTITIONS",
    [VP8E_SET_ARNR_MAXFRAMES]    = "VP8E_SET_ARNR_MAXFRAMES",
    [VP8E_SET_ARNR_STRENGTH]     = "VP8E_SET_ARNR_STRENGTH",
    [VP8E_SET_ARNR_TYPE]         = "VP8E_SET_ARNR_TYPE",
    [VP8E_SET_TUNING]            = "VP8E_SET_TUNING",
    [VP8E_SET_CQ_LEVEL]          = "VP8E_SET_CQ_LEVEL",
    [VP8E_SET_MAX_INTRA_BITRATE_PCT] = "VP8E_SET_MAX_INTRA_BITRATE_PCT",
    [VP8E_SET_SHARPNESS]               = "VP8E_SET_SHARPNESS",
    [VP8E_SET_TEMPORAL_LAYER_ID]       = "VP8E_SET_TEMPORAL_LAYER_ID",
#if CONFIG_LIBVPX_VP9_ENCODER
    [VP9E_SET_LOSSLESS]                = "VP9E_SET_LOSSLESS",
    [VP9E_SET_TILE_COLUMNS]            = "VP9E_SET_TILE_COLUMNS",
    [VP9E_SET_TILE_ROWS]               = "VP9E_SET_TILE_ROWS",
    [VP9E_SET_FRAME_PARALLEL_DECODING] = "VP9E_SET_FRAME_PARALLEL_DECODING",
    [VP9E_SET_AQ_MODE]                 = "VP9E_SET_AQ_MODE",
    [VP9E_SET_COLOR_SPACE]             = "VP9E_SET_COLOR_SPACE",
    [VP9E_SET_SVC_LAYER_ID]            = "VP9E_SET_SVC_LAYER_ID",
#if VPX_ENCODER_ABI_VERSION >= 12
    [VP9E_SET_SVC_PARAMETERS]          = "VP9E_SET_SVC_PARAMETERS",
#endif
    [VP9E_SET_SVC]                     = "VP9E_SET_SVC",
#if VPX_ENCODER_ABI_VERSION >= 11
    [VP9E_SET_COLOR_RANGE]             = "VP9E_SET_COLOR_RANGE",
#endif
#if VPX_ENCODER_ABI_VERSION >= 12
    [VP9E_SET_TARGET_LEVEL]            = "VP9E_SET_TARGET_LEVEL",
    [VP9E_GET_LEVEL]                   = "VP9E_GET_LEVEL",
#endif
#ifdef VPX_CTRL_VP9E_SET_ROW_MT
    [VP9E_SET_ROW_MT]                  = "VP9E_SET_ROW_MT",
#endif
#ifdef VPX_CTRL_VP9E_SET_TUNE_CONTENT
    [VP9E_SET_TUNE_CONTENT]            = "VP9E_SET_TUNE_CONTENT",
#endif
#ifdef VPX_CTRL_VP9E_SET_TPL
    [VP9E_SET_TPL]                     = "VP9E_SET_TPL",
#endif
#endif
};

static av_cold void log_encoder_error(AVCodecContext *avctx, const char *desc)
{
    VPxContext *ctx = avctx->priv_data;
    const char *error  = vpx_codec_error(&ctx->encoder);
    const char *detail = vpx_codec_error_detail(&ctx->encoder);

    av_log(avctx, AV_LOG_ERROR, "%s: %s\n", desc, error);
    if (detail)
        av_log(avctx, AV_LOG_ERROR, "  Additional information: %s\n", detail);
}

static av_cold void dump_enc_cfg(AVCodecContext *avctx,
                                 const struct vpx_codec_enc_cfg *cfg)
{
    int width = -30;
    int level = AV_LOG_DEBUG;
    int i;

    av_log(avctx, level, "vpx_codec_enc_cfg\n");
    av_log(avctx, level, "generic settings\n"
           "  %*s%u\n  %*s%u\n  %*s%u\n  %*s%u\n  %*s%u\n"
#if CONFIG_LIBVPX_VP9_ENCODER
           "  %*s%u\n  %*s%u\n"
#endif
           "  %*s{%u/%u}\n  %*s%u\n  %*s%d\n  %*s%u\n",
           width, "g_usage:",           cfg->g_usage,
           width, "g_threads:",         cfg->g_threads,
           width, "g_profile:",         cfg->g_profile,
           width, "g_w:",               cfg->g_w,
           width, "g_h:",               cfg->g_h,
#if CONFIG_LIBVPX_VP9_ENCODER
           width, "g_bit_depth:",       cfg->g_bit_depth,
           width, "g_input_bit_depth:", cfg->g_input_bit_depth,
#endif
           width, "g_timebase:",        cfg->g_timebase.num, cfg->g_timebase.den,
           width, "g_error_resilient:", cfg->g_error_resilient,
           width, "g_pass:",            cfg->g_pass,
           width, "g_lag_in_frames:",   cfg->g_lag_in_frames);
    av_log(avctx, level, "rate control settings\n"
           "  %*s%u\n  %*s%u\n  %*s%u\n  %*s%u\n"
           "  %*s%d\n  %*s%p(%"SIZE_SPECIFIER")\n  %*s%u\n",
           width, "rc_dropframe_thresh:",   cfg->rc_dropframe_thresh,
           width, "rc_resize_allowed:",     cfg->rc_resize_allowed,
           width, "rc_resize_up_thresh:",   cfg->rc_resize_up_thresh,
           width, "rc_resize_down_thresh:", cfg->rc_resize_down_thresh,
           width, "rc_end_usage:",          cfg->rc_end_usage,
           width, "rc_twopass_stats_in:",   cfg->rc_twopass_stats_in.buf, cfg->rc_twopass_stats_in.sz,
           width, "rc_target_bitrate:",     cfg->rc_target_bitrate);
    av_log(avctx, level, "quantizer settings\n"
           "  %*s%u\n  %*s%u\n",
           width, "rc_min_quantizer:", cfg->rc_min_quantizer,
           width, "rc_max_quantizer:", cfg->rc_max_quantizer);
    av_log(avctx, level, "bitrate tolerance\n"
           "  %*s%u\n  %*s%u\n",
           width, "rc_undershoot_pct:", cfg->rc_undershoot_pct,
           width, "rc_overshoot_pct:",  cfg->rc_overshoot_pct);
    av_log(avctx, level, "temporal layering settings\n"
           "  %*s%u\n", width, "ts_number_layers:", cfg->ts_number_layers);
    if (avctx->codec_id == AV_CODEC_ID_VP8) {
        av_log(avctx, level,
               "\n  %*s", width, "ts_target_bitrate:");
        for (i = 0; i < VPX_TS_MAX_LAYERS; i++)
            av_log(avctx, level,
                   "%u ", cfg->ts_target_bitrate[i]);
    }
#if (VPX_ENCODER_ABI_VERSION >= 12) && CONFIG_LIBVPX_VP9_ENCODER
    if (avctx->codec_id == AV_CODEC_ID_VP9) {
        av_log(avctx, level,
               "\n  %*s", width, "layer_target_bitrate:");
        for (i = 0; i < VPX_TS_MAX_LAYERS; i++)
            av_log(avctx, level,
                   "%u ", cfg->layer_target_bitrate[i]);
    }
#endif
    av_log(avctx, level, "\n");
    av_log(avctx, level,
           "\n  %*s", width, "ts_rate_decimator:");
    for (i = 0; i < VPX_TS_MAX_LAYERS; i++)
        av_log(avctx, level, "%u ", cfg->ts_rate_decimator[i]);
    av_log(avctx, level, "\n");
    av_log(avctx, level,
           "\n  %*s%u\n", width, "ts_periodicity:", cfg->ts_periodicity);
    av_log(avctx, level,
           "\n  %*s", width, "ts_layer_id:");
    for (i = 0; i < VPX_TS_MAX_PERIODICITY; i++)
        av_log(avctx, level, "%u ", cfg->ts_layer_id[i]);
    av_log(avctx, level, "\n");
    av_log(avctx, level, "decoder buffer model\n"
            "  %*s%u\n  %*s%u\n  %*s%u\n",
            width, "rc_buf_sz:",         cfg->rc_buf_sz,
            width, "rc_buf_initial_sz:", cfg->rc_buf_initial_sz,
            width, "rc_buf_optimal_sz:", cfg->rc_buf_optimal_sz);
    av_log(avctx, level, "2 pass rate control settings\n"
           "  %*s%u\n  %*s%u\n  %*s%u\n",
           width, "rc_2pass_vbr_bias_pct:",       cfg->rc_2pass_vbr_bias_pct,
           width, "rc_2pass_vbr_minsection_pct:", cfg->rc_2pass_vbr_minsection_pct,
           width, "rc_2pass_vbr_maxsection_pct:", cfg->rc_2pass_vbr_maxsection_pct);
#if VPX_ENCODER_ABI_VERSION >= 14
    av_log(avctx, level, "  %*s%u\n",
           width, "rc_2pass_vbr_corpus_complexity:", cfg->rc_2pass_vbr_corpus_complexity);
#endif
    av_log(avctx, level, "keyframing settings\n"
           "  %*s%d\n  %*s%u\n  %*s%u\n",
           width, "kf_mode:",     cfg->kf_mode,
           width, "kf_min_dist:", cfg->kf_min_dist,
           width, "kf_max_dist:", cfg->kf_max_dist);
    av_log(avctx, level, "\n");
}

static void coded_frame_add(void *list, struct FrameListData *cx_frame)
{
    struct FrameListData **p = list;

    while (*p)
        p = &(*p)->next;
    *p = cx_frame;
    cx_frame->next = NULL;
}

static av_cold void free_coded_frame(struct FrameListData *cx_frame)
{
    av_freep(&cx_frame->buf);
    if (cx_frame->buf_alpha)
        av_freep(&cx_frame->buf_alpha);
    av_freep(&cx_frame);
}

static av_cold void free_frame_list(struct FrameListData *list)
{
    struct FrameListData *p = list;

    while (p) {
        list = list->next;
        free_coded_frame(p);
        p = list;
    }
}

static av_cold int codecctl_int(AVCodecContext *avctx,
                                enum vp8e_enc_control_id id, int val)
{
    VPxContext *ctx = avctx->priv_data;
    char buf[80];
    int width = -30;
    int res;

    snprintf(buf, sizeof(buf), "%s:", ctlidstr[id]);
    av_log(avctx, AV_LOG_DEBUG, "  %*s%d\n", width, buf, val);

    res = vpx_codec_control(&ctx->encoder, id, val);
    if (res != VPX_CODEC_OK) {
        snprintf(buf, sizeof(buf), "Failed to set %s codec control",
                 ctlidstr[id]);
        log_encoder_error(avctx, buf);
    }

    return res == VPX_CODEC_OK ? 0 : AVERROR(EINVAL);
}

#if VPX_ENCODER_ABI_VERSION >= 12
static av_cold int codecctl_intp(AVCodecContext *avctx,
                                 enum vp8e_enc_control_id id, int *val)
{
    VPxContext *ctx = avctx->priv_data;
    char buf[80];
    int width = -30;
    int res;

    snprintf(buf, sizeof(buf), "%s:", ctlidstr[id]);
    av_log(avctx, AV_LOG_DEBUG, "  %*s%d\n", width, buf, *val);

    res = vpx_codec_control(&ctx->encoder, id, val);
    if (res != VPX_CODEC_OK) {
        snprintf(buf, sizeof(buf), "Failed to set %s codec control",
                 ctlidstr[id]);
        log_encoder_error(avctx, buf);
    }

    return res == VPX_CODEC_OK ? 0 : AVERROR(EINVAL);
}
#endif

static av_cold int vpx_free(AVCodecContext *avctx)
{
    VPxContext *ctx = avctx->priv_data;

#if VPX_ENCODER_ABI_VERSION >= 12
    if (avctx->codec_id == AV_CODEC_ID_VP9 && ctx->level >= 0 &&
        !(avctx->flags & AV_CODEC_FLAG_PASS1)) {
        int level_out = 0;
        if (!codecctl_intp(avctx, VP9E_GET_LEVEL, &level_out))
            av_log(avctx, AV_LOG_INFO, "Encoded level %.1f\n", level_out * 0.1);
    }
#endif

    av_freep(&ctx->ts_layer_flags);

    vpx_codec_destroy(&ctx->encoder);
    if (ctx->is_alpha) {
        vpx_codec_destroy(&ctx->encoder_alpha);
        av_freep(&ctx->rawimg_alpha.planes[VPX_PLANE_U]);
        av_freep(&ctx->rawimg_alpha.planes[VPX_PLANE_V]);
    }
    av_freep(&ctx->twopass_stats.buf);
    av_freep(&avctx->stats_out);
    free_frame_list(ctx->coded_frame_list);
    return 0;
}

static void vp8_ts_parse_int_array(int *dest, char *value, size_t value_len, int max_entries)
{
    int dest_idx = 0;
    char *saveptr = NULL;
    char *token = av_strtok(value, ",", &saveptr);

    while (token && dest_idx < max_entries) {
        dest[dest_idx++] = strtoul(token, NULL, 10);
        token = av_strtok(NULL, ",", &saveptr);
    }
}

static void set_temporal_layer_pattern(int layering_mode, vpx_codec_enc_cfg_t *cfg,
                                       int *layer_flags, int *flag_periodicity)
{
    switch (layering_mode) {
    case 2: {
        /**
         * 2-layers, 2-frame period.
         */
        static const int ids[2] = { 0, 1 };
        cfg->ts_periodicity = 2;
        *flag_periodicity = 2;
        cfg->ts_number_layers = 2;
        cfg->ts_rate_decimator[0] = 2;
        cfg->ts_rate_decimator[1] = 1;
        memcpy(cfg->ts_layer_id, ids, sizeof(ids));

        layer_flags[0] =
             VP8_EFLAG_NO_REF_GF | VP8_EFLAG_NO_REF_ARF |
             VP8_EFLAG_NO_UPD_GF | VP8_EFLAG_NO_UPD_ARF;
        layer_flags[1] =
            VP8_EFLAG_NO_UPD_ARF | VP8_EFLAG_NO_UPD_GF |
            VP8_EFLAG_NO_UPD_LAST |
            VP8_EFLAG_NO_REF_ARF | VP8_EFLAG_NO_REF_GF;
        break;
    }
    case 3: {
        /**
         * 3-layers structure with one reference frame.
         *  This works same as temporal_layering_mode 3.
         *
         * 3-layers, 4-frame period.
         */
        static const int ids[4] = { 0, 2, 1, 2 };
        cfg->ts_periodicity = 4;
        *flag_periodicity = 4;
        cfg->ts_number_layers = 3;
        cfg->ts_rate_decimator[0] = 4;
        cfg->ts_rate_decimator[1] = 2;
        cfg->ts_rate_decimator[2] = 1;
        memcpy(cfg->ts_layer_id, ids, sizeof(ids));

        /**
         * 0=L, 1=GF, 2=ARF,
         * Intra-layer prediction disabled.
         */
        layer_flags[0] =
            VP8_EFLAG_NO_REF_GF | VP8_EFLAG_NO_REF_ARF |
            VP8_EFLAG_NO_UPD_GF | VP8_EFLAG_NO_UPD_ARF;
        layer_flags[1] =
            VP8_EFLAG_NO_REF_GF | VP8_EFLAG_NO_REF_ARF |
            VP8_EFLAG_NO_UPD_LAST | VP8_EFLAG_NO_UPD_GF |
            VP8_EFLAG_NO_UPD_ARF;
        layer_flags[2] =
            VP8_EFLAG_NO_REF_GF | VP8_EFLAG_NO_REF_ARF |
            VP8_EFLAG_NO_UPD_ARF | VP8_EFLAG_NO_UPD_LAST;
        layer_flags[3] =
            VP8_EFLAG_NO_REF_LAST | VP8_EFLAG_NO_REF_ARF |
            VP8_EFLAG_NO_UPD_LAST | VP8_EFLAG_NO_UPD_GF |
            VP8_EFLAG_NO_UPD_ARF;
        break;
    }
    case 4: {
        /**
         * 3-layers structure.
         * added dependency between the two TL2 frames (on top of case 3).
         * 3-layers, 4-frame period.
         */
        static const int ids[4] = { 0, 2, 1, 2 };
        cfg->ts_periodicity = 4;
        *flag_periodicity = 4;
        cfg->ts_number_layers = 3;
        cfg->ts_rate_decimator[0] = 4;
        cfg->ts_rate_decimator[1] = 2;
        cfg->ts_rate_decimator[2] = 1;
        memcpy(cfg->ts_layer_id, ids, sizeof(ids));

        /**
         * 0=L, 1=GF, 2=ARF, Intra-layer prediction disabled.
         */
        layer_flags[0] =
            VP8_EFLAG_NO_REF_GF | VP8_EFLAG_NO_REF_ARF |
            VP8_EFLAG_NO_UPD_GF | VP8_EFLAG_NO_UPD_ARF;
        layer_flags[1] =
            VP8_EFLAG_NO_REF_GF | VP8_EFLAG_NO_REF_ARF |
            VP8_EFLAG_NO_UPD_LAST | VP8_EFLAG_NO_UPD_GF;
        layer_flags[2] =
            VP8_EFLAG_NO_REF_GF | VP8_EFLAG_NO_REF_ARF |
            VP8_EFLAG_NO_UPD_ARF | VP8_EFLAG_NO_UPD_LAST;
        layer_flags[3] =
            VP8_EFLAG_NO_REF_LAST |
            VP8_EFLAG_NO_UPD_LAST | VP8_EFLAG_NO_UPD_GF |
            VP8_EFLAG_NO_UPD_ARF;
        break;
    }
    default:
        /**
         * do not change the layer_flags or the flag_periodicity in this case;
         * it might be that the code is using external flags to be used.
         */
        break;

    }
}

static int vpx_ts_param_parse(VPxContext *ctx, struct vpx_codec_enc_cfg *enccfg,
                              char *key, char *value, enum AVCodecID codec_id)
{
    size_t value_len = strlen(value);
    int ts_layering_mode = 0;

    if (!value_len)
        return -1;

    if (!strcmp(key, "ts_number_layers"))
        enccfg->ts_number_layers = strtoul(value, &value, 10);
    else if (!strcmp(key, "ts_target_bitrate")) {
        if (codec_id == AV_CODEC_ID_VP8)
            vp8_ts_parse_int_array(enccfg->ts_target_bitrate, value, value_len, VPX_TS_MAX_LAYERS);
#if (VPX_ENCODER_ABI_VERSION >= 12) && CONFIG_LIBVPX_VP9_ENCODER
        if (codec_id == AV_CODEC_ID_VP9)
            vp8_ts_parse_int_array(enccfg->layer_target_bitrate, value, value_len, VPX_TS_MAX_LAYERS);
#endif
    } else if (!strcmp(key, "ts_rate_decimator")) {
        vp8_ts_parse_int_array(enccfg->ts_rate_decimator, value, value_len, VPX_TS_MAX_LAYERS);
    } else if (!strcmp(key, "ts_periodicity")) {
        enccfg->ts_periodicity = strtoul(value, &value, 10);
    } else if (!strcmp(key, "ts_layer_id")) {
        vp8_ts_parse_int_array(enccfg->ts_layer_id, value, value_len, VPX_TS_MAX_PERIODICITY);
    } else if (!strcmp(key, "ts_layering_mode")) {
        /* option for pre-defined temporal structures in function set_temporal_layer_pattern. */
        ts_layering_mode = strtoul(value, &value, 4);
    }

#if (VPX_ENCODER_ABI_VERSION >= 12) && CONFIG_LIBVPX_VP9_ENCODER
    enccfg->temporal_layering_mode = VP9E_TEMPORAL_LAYERING_MODE_BYPASS; // only bypass mode is supported for now.
    enccfg->ss_number_layers = 1; // TODO: add spatial scalability support.
#endif
    if (ts_layering_mode) {
        // make sure the ts_layering_mode comes at the end of the ts_parameter string to ensure that
        // correct configuration is done.
        ctx->ts_layer_flags = av_malloc_array(VPX_TS_MAX_PERIODICITY, sizeof(*ctx->ts_layer_flags));
        set_temporal_layer_pattern(ts_layering_mode, enccfg, ctx->ts_layer_flags, &enccfg->ts_periodicity);
    }

    return 0;
}

#if CONFIG_LIBVPX_VP9_ENCODER
static int set_pix_fmt(AVCodecContext *avctx, vpx_codec_caps_t codec_caps,
                       struct vpx_codec_enc_cfg *enccfg, vpx_codec_flags_t *flags,
                       vpx_img_fmt_t *img_fmt)
{
    VPxContext av_unused *ctx = avctx->priv_data;
    const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(avctx->pix_fmt);
    enccfg->g_bit_depth = enccfg->g_input_bit_depth = desc->comp[0].depth;
    switch (avctx->pix_fmt) {
    case AV_PIX_FMT_YUV420P:
    case AV_PIX_FMT_YUVA420P:
        enccfg->g_profile = 0;
        *img_fmt = VPX_IMG_FMT_I420;
        return 0;
    case AV_PIX_FMT_YUV422P:
        enccfg->g_profile = 1;
        *img_fmt = VPX_IMG_FMT_I422;
        return 0;
    case AV_PIX_FMT_YUV440P:
        enccfg->g_profile = 1;
        *img_fmt = VPX_IMG_FMT_I440;
        return 0;
    case AV_PIX_FMT_GBRP:
        ctx->vpx_cs = VPX_CS_SRGB;
    case AV_PIX_FMT_YUV444P:
        enccfg->g_profile = 1;
        *img_fmt = VPX_IMG_FMT_I444;
        return 0;
    case AV_PIX_FMT_YUV420P10:
    case AV_PIX_FMT_YUV420P12:
        if (codec_caps & VPX_CODEC_CAP_HIGHBITDEPTH) {
            enccfg->g_profile = 2;
            *img_fmt = VPX_IMG_FMT_I42016;
            *flags |= VPX_CODEC_USE_HIGHBITDEPTH;
            return 0;
        }
        break;
    case AV_PIX_FMT_YUV422P10:
    case AV_PIX_FMT_YUV422P12:
        if (codec_caps & VPX_CODEC_CAP_HIGHBITDEPTH) {
            enccfg->g_profile = 3;
            *img_fmt = VPX_IMG_FMT_I42216;
            *flags |= VPX_CODEC_USE_HIGHBITDEPTH;
            return 0;
        }
        break;
    case AV_PIX_FMT_YUV440P10:
    case AV_PIX_FMT_YUV440P12:
        if (codec_caps & VPX_CODEC_CAP_HIGHBITDEPTH) {
            enccfg->g_profile = 3;
            *img_fmt = VPX_IMG_FMT_I44016;
            *flags |= VPX_CODEC_USE_HIGHBITDEPTH;
            return 0;
        }
        break;
    case AV_PIX_FMT_GBRP10:
    case AV_PIX_FMT_GBRP12:
        ctx->vpx_cs = VPX_CS_SRGB;
    case AV_PIX_FMT_YUV444P10:
    case AV_PIX_FMT_YUV444P12:
        if (codec_caps & VPX_CODEC_CAP_HIGHBITDEPTH) {
            enccfg->g_profile = 3;
            *img_fmt = VPX_IMG_FMT_I44416;
            *flags |= VPX_CODEC_USE_HIGHBITDEPTH;
            return 0;
        }
        break;
    default:
        break;
    }
    av_log(avctx, AV_LOG_ERROR, "Unsupported pixel format.\n");
    return AVERROR_INVALIDDATA;
}

static void set_colorspace(AVCodecContext *avctx)
{
    enum vpx_color_space vpx_cs;
    VPxContext *ctx = avctx->priv_data;

    if (ctx->vpx_cs) {
        vpx_cs = ctx->vpx_cs;
    } else {
        switch (avctx->colorspace) {
        case AVCOL_SPC_RGB:         vpx_cs = VPX_CS_SRGB;      break;
        case AVCOL_SPC_BT709:       vpx_cs = VPX_CS_BT_709;    break;
        case AVCOL_SPC_UNSPECIFIED: vpx_cs = VPX_CS_UNKNOWN;   break;
        case AVCOL_SPC_RESERVED:    vpx_cs = VPX_CS_RESERVED;  break;
        case AVCOL_SPC_BT470BG:     vpx_cs = VPX_CS_BT_601;    break;
        case AVCOL_SPC_SMPTE170M:   vpx_cs = VPX_CS_SMPTE_170; break;
        case AVCOL_SPC_SMPTE240M:   vpx_cs = VPX_CS_SMPTE_240; break;
        case AVCOL_SPC_BT2020_NCL:  vpx_cs = VPX_CS_BT_2020;   break;
        default:
            av_log(avctx, AV_LOG_WARNING, "Unsupported colorspace (%d)\n",
                   avctx->colorspace);
            return;
        }
    }
    codecctl_int(avctx, VP9E_SET_COLOR_SPACE, vpx_cs);
}

#if VPX_ENCODER_ABI_VERSION >= 11
static void set_color_range(AVCodecContext *avctx)
{
    enum vpx_color_range vpx_cr;
    switch (avctx->color_range) {
    case AVCOL_RANGE_UNSPECIFIED:
    case AVCOL_RANGE_MPEG:       vpx_cr = VPX_CR_STUDIO_RANGE; break;
    case AVCOL_RANGE_JPEG:       vpx_cr = VPX_CR_FULL_RANGE;   break;
    default:
        av_log(avctx, AV_LOG_WARNING, "Unsupported color range (%d)\n",
               avctx->color_range);
        return;
    }

    codecctl_int(avctx, VP9E_SET_COLOR_RANGE, vpx_cr);
}
#endif
#endif

/**
 * Set the target bitrate to VPX library default. Also set CRF to 32 if needed.
 */
static void set_vp8_defaults(AVCodecContext *avctx,
                             struct vpx_codec_enc_cfg *enccfg)
{
    VPxContext *ctx = avctx->priv_data;
    av_assert0(!avctx->bit_rate);
    avctx->bit_rate = enccfg->rc_target_bitrate * 1000;
    if (enccfg->rc_end_usage == VPX_CQ) {
        av_log(avctx, AV_LOG_WARNING,
               "Bitrate not specified for constrained quality mode, using default of %dkbit/sec\n",
               enccfg->rc_target_bitrate);
    } else {
        enccfg->rc_end_usage = VPX_CQ;
        ctx->crf = 32;
        av_log(avctx, AV_LOG_WARNING,
               "Neither bitrate nor constrained quality specified, using default CRF of %d and bitrate of %dkbit/sec\n",
               ctx->crf, enccfg->rc_target_bitrate);
    }
}


#if CONFIG_LIBVPX_VP9_ENCODER
/**
 * Keep the target bitrate at 0 to engage constant quality mode. If CRF is not
 * set, use 32.
 */
static void set_vp9_defaults(AVCodecContext *avctx,
                             struct vpx_codec_enc_cfg *enccfg)
{
    VPxContext *ctx = avctx->priv_data;
    av_assert0(!avctx->bit_rate);
    if (enccfg->rc_end_usage != VPX_Q && ctx->lossless < 0) {
        enccfg->rc_end_usage = VPX_Q;
        ctx->crf = 32;
        av_log(avctx, AV_LOG_WARNING,
               "Neither bitrate nor constrained quality specified, using default CRF of %d\n",
               ctx->crf);
    }
}
#endif

/**
 * Called when the bitrate is not set. It sets appropriate default values for
 * bitrate and CRF.
 */
static void set_vpx_defaults(AVCodecContext *avctx,
                             struct vpx_codec_enc_cfg *enccfg)
{
    av_assert0(!avctx->bit_rate);
#if CONFIG_LIBVPX_VP9_ENCODER
    if (avctx->codec_id == AV_CODEC_ID_VP9) {
        set_vp9_defaults(avctx, enccfg);
        return;
    }
#endif
    set_vp8_defaults(avctx, enccfg);
}

static av_cold int vpx_init(AVCodecContext *avctx,
                            const struct vpx_codec_iface *iface)
{
    VPxContext *ctx = avctx->priv_data;
    struct vpx_codec_enc_cfg enccfg = { 0 };
    struct vpx_codec_enc_cfg enccfg_alpha;
    vpx_codec_flags_t flags = (avctx->flags & AV_CODEC_FLAG_PSNR) ? VPX_CODEC_USE_PSNR : 0;
    AVCPBProperties *cpb_props;
    int res;
    vpx_img_fmt_t img_fmt = VPX_IMG_FMT_I420;
#if CONFIG_LIBVPX_VP9_ENCODER
    vpx_codec_caps_t codec_caps = vpx_codec_get_caps(iface);
    vpx_svc_extra_cfg_t svc_params;
#endif
    AVDictionaryEntry* en = NULL;

    av_log(avctx, AV_LOG_INFO, "%s\n", vpx_codec_version_str());
    av_log(avctx, AV_LOG_VERBOSE, "%s\n", vpx_codec_build_config());

    if (avctx->pix_fmt == AV_PIX_FMT_YUVA420P)
        ctx->is_alpha = 1;

    if ((res = vpx_codec_enc_config_default(iface, &enccfg, 0)) != VPX_CODEC_OK) {
        av_log(avctx, AV_LOG_ERROR, "Failed to get config: %s\n",
               vpx_codec_err_to_string(res));
        return AVERROR(EINVAL);
    }

#if CONFIG_LIBVPX_VP9_ENCODER
    if (avctx->codec_id == AV_CODEC_ID_VP9) {
        if (set_pix_fmt(avctx, codec_caps, &enccfg, &flags, &img_fmt))
            return AVERROR(EINVAL);
    }
#endif

    if(!avctx->bit_rate)
        if(avctx->rc_max_rate || avctx->rc_buffer_size || avctx->rc_initial_buffer_occupancy) {
            av_log( avctx, AV_LOG_ERROR, "Rate control parameters set without a bitrate\n");
            return AVERROR(EINVAL);
        }

    dump_enc_cfg(avctx, &enccfg);

    enccfg.g_w            = avctx->width;
    enccfg.g_h            = avctx->height;
    enccfg.g_timebase.num = avctx->time_base.num;
    enccfg.g_timebase.den = avctx->time_base.den;
    enccfg.g_threads      =
        FFMIN(avctx->thread_count ? avctx->thread_count : av_cpu_count(), 16);
    enccfg.g_lag_in_frames= ctx->lag_in_frames;

    if (avctx->flags & AV_CODEC_FLAG_PASS1)
        enccfg.g_pass = VPX_RC_FIRST_PASS;
    else if (avctx->flags & AV_CODEC_FLAG_PASS2)
        enccfg.g_pass = VPX_RC_LAST_PASS;
    else
        enccfg.g_pass = VPX_RC_ONE_PASS;

    if (avctx->rc_min_rate == avctx->rc_max_rate &&
        avctx->rc_min_rate == avctx->bit_rate && avctx->bit_rate) {
        enccfg.rc_end_usage = VPX_CBR;
    } else if (ctx->crf >= 0) {
        enccfg.rc_end_usage = VPX_CQ;
#if CONFIG_LIBVPX_VP9_ENCODER
        if (!avctx->bit_rate && avctx->codec_id == AV_CODEC_ID_VP9)
            enccfg.rc_end_usage = VPX_Q;
#endif
    }

    if (avctx->bit_rate) {
        enccfg.rc_target_bitrate = av_rescale_rnd(avctx->bit_rate, 1, 1000,
                                                  AV_ROUND_NEAR_INF);
#if CONFIG_LIBVPX_VP9_ENCODER
        enccfg.ss_target_bitrate[0] = enccfg.rc_target_bitrate;
#endif
    } else {
        // Set bitrate to default value. Also sets CRF to default if needed.
        set_vpx_defaults(avctx, &enccfg);
    }

    if (avctx->codec_id == AV_CODEC_ID_VP9 && ctx->lossless == 1) {
        enccfg.rc_min_quantizer =
        enccfg.rc_max_quantizer = 0;
    } else {
        if (avctx->qmin >= 0)
            enccfg.rc_min_quantizer = avctx->qmin;
        if (avctx->qmax >= 0)
            enccfg.rc_max_quantizer = avctx->qmax;
    }

    if (enccfg.rc_end_usage == VPX_CQ
#if CONFIG_LIBVPX_VP9_ENCODER
        || enccfg.rc_end_usage == VPX_Q
#endif
       ) {
        if (ctx->crf < enccfg.rc_min_quantizer || ctx->crf > enccfg.rc_max_quantizer) {
            av_log(avctx, AV_LOG_ERROR,
                   "CQ level %d must be between minimum and maximum quantizer value (%d-%d)\n",
                   ctx->crf, enccfg.rc_min_quantizer, enccfg.rc_max_quantizer);
            return AVERROR(EINVAL);
        }
    }

#if FF_API_PRIVATE_OPT
FF_DISABLE_DEPRECATION_WARNINGS
    if (avctx->frame_skip_threshold)
        ctx->drop_threshold = avctx->frame_skip_threshold;
FF_ENABLE_DEPRECATION_WARNINGS
#endif
    enccfg.rc_dropframe_thresh = ctx->drop_threshold;

    //0-100 (0 => CBR, 100 => VBR)
    enccfg.rc_2pass_vbr_bias_pct           = lrint(avctx->qcompress * 100);
    if (avctx->bit_rate)
        enccfg.rc_2pass_vbr_minsection_pct =
            avctx->rc_min_rate * 100LL / avctx->bit_rate;
    if (avctx->rc_max_rate)
        enccfg.rc_2pass_vbr_maxsection_pct =
            avctx->rc_max_rate * 100LL / avctx->bit_rate;
#if CONFIG_LIBVPX_VP9_ENCODER
    if (avctx->codec_id == AV_CODEC_ID_VP9) {
#if VPX_ENCODER_ABI_VERSION >= 14
        if (ctx->corpus_complexity >= 0)
            enccfg.rc_2pass_vbr_corpus_complexity = ctx->corpus_complexity;
#endif
    }
#endif

    if (avctx->rc_buffer_size)
        enccfg.rc_buf_sz         =
            avctx->rc_buffer_size * 1000LL / avctx->bit_rate;
    if (avctx->rc_initial_buffer_occupancy)
        enccfg.rc_buf_initial_sz =
            avctx->rc_initial_buffer_occupancy * 1000LL / avctx->bit_rate;
    enccfg.rc_buf_optimal_sz     = enccfg.rc_buf_sz * 5 / 6;
    if (ctx->rc_undershoot_pct >= 0)
        enccfg.rc_undershoot_pct = ctx->rc_undershoot_pct;
    if (ctx->rc_overshoot_pct >= 0)
        enccfg.rc_overshoot_pct = ctx->rc_overshoot_pct;

    //_enc_init() will balk if kf_min_dist differs from max w/VPX_KF_AUTO
    if (avctx->keyint_min >= 0 && avctx->keyint_min == avctx->gop_size)
        enccfg.kf_min_dist = avctx->keyint_min;
    if (avctx->gop_size >= 0)
        enccfg.kf_max_dist = avctx->gop_size;

    if (enccfg.g_pass == VPX_RC_FIRST_PASS)
        enccfg.g_lag_in_frames = 0;
    else if (enccfg.g_pass == VPX_RC_LAST_PASS) {
        int decode_size, ret;

        if (!avctx->stats_in) {
            av_log(avctx, AV_LOG_ERROR, "No stats file for second pass\n");
            return AVERROR_INVALIDDATA;
        }

        ctx->twopass_stats.sz  = strlen(avctx->stats_in) * 3 / 4;
        ret = av_reallocp(&ctx->twopass_stats.buf, ctx->twopass_stats.sz);
        if (ret < 0) {
            av_log(avctx, AV_LOG_ERROR,
                   "Stat buffer alloc (%"SIZE_SPECIFIER" bytes) failed\n",
                   ctx->twopass_stats.sz);
            ctx->twopass_stats.sz = 0;
            return ret;
        }
        decode_size = av_base64_decode(ctx->twopass_stats.buf, avctx->stats_in,
                                       ctx->twopass_stats.sz);
        if (decode_size < 0) {
            av_log(avctx, AV_LOG_ERROR, "Stat buffer decode failed\n");
            return AVERROR_INVALIDDATA;
        }

        ctx->twopass_stats.sz      = decode_size;
        enccfg.rc_twopass_stats_in = ctx->twopass_stats;
    }

    /* 0-3: For non-zero values the encoder increasingly optimizes for reduced
       complexity playback on low powered devices at the expense of encode
       quality. */
    if (avctx->profile != FF_PROFILE_UNKNOWN)
        enccfg.g_profile = avctx->profile;

    enccfg.g_error_resilient = ctx->error_resilient || ctx->flags & VP8F_ERROR_RESILIENT;

    while ((en = av_dict_get(ctx->vpx_ts_parameters, "", en, AV_DICT_IGNORE_SUFFIX))) {
        if (vpx_ts_param_parse(ctx, &enccfg, en->key, en->value, avctx->codec_id) < 0)
            av_log(avctx, AV_LOG_WARNING,
                   "Error parsing option '%s = %s'.\n",
                   en->key, en->value);
    }

    dump_enc_cfg(avctx, &enccfg);
    /* Construct Encoder Context */
    res = vpx_codec_enc_init(&ctx->encoder, iface, &enccfg, flags);
    if (res != VPX_CODEC_OK) {
        log_encoder_error(avctx, "Failed to initialize encoder");
        return AVERROR(EINVAL);
    }
#if CONFIG_LIBVPX_VP9_ENCODER
    if (avctx->codec_id == AV_CODEC_ID_VP9 && enccfg.ts_number_layers > 1) {
        memset(&svc_params, 0, sizeof(svc_params));
        for (int i = 0; i < enccfg.ts_number_layers; ++i) {
            svc_params.max_quantizers[i] = enccfg.rc_max_quantizer;
            svc_params.min_quantizers[i] = enccfg.rc_min_quantizer;
        }
        svc_params.scaling_factor_num[0] = enccfg.g_h;
        svc_params.scaling_factor_den[0] = enccfg.g_h;
#if VPX_ENCODER_ABI_VERSION >= 12
        codecctl_int(avctx, VP9E_SET_SVC, 1);
        codecctl_intp(avctx, VP9E_SET_SVC_PARAMETERS, (int *)&svc_params);
#endif
    }
#endif
    if (ctx->is_alpha) {
        enccfg_alpha = enccfg;
        res = vpx_codec_enc_init(&ctx->encoder_alpha, iface, &enccfg_alpha, flags);
        if (res != VPX_CODEC_OK) {
            log_encoder_error(avctx, "Failed to initialize alpha encoder");
            return AVERROR(EINVAL);
        }
    }

    //codec control failures are currently treated only as warnings
    av_log(avctx, AV_LOG_DEBUG, "vpx_codec_control\n");
    codecctl_int(avctx, VP8E_SET_CPUUSED,          ctx->cpu_used);
    if (ctx->flags & VP8F_AUTO_ALT_REF)
        ctx->auto_alt_ref = 1;
    if (ctx->auto_alt_ref >= 0)
        codecctl_int(avctx, VP8E_SET_ENABLEAUTOALTREF,
                     avctx->codec_id == AV_CODEC_ID_VP8 ? !!ctx->auto_alt_ref : ctx->auto_alt_ref);
    if (ctx->arnr_max_frames >= 0)
        codecctl_int(avctx, VP8E_SET_ARNR_MAXFRAMES,   ctx->arnr_max_frames);
    if (ctx->arnr_strength >= 0)
        codecctl_int(avctx, VP8E_SET_ARNR_STRENGTH,    ctx->arnr_strength);
    if (ctx->arnr_type >= 0)
        codecctl_int(avctx, VP8E_SET_ARNR_TYPE,        ctx->arnr_type);
    if (ctx->tune >= 0)
        codecctl_int(avctx, VP8E_SET_TUNING,           ctx->tune);

    if (ctx->auto_alt_ref && ctx->is_alpha && avctx->codec_id == AV_CODEC_ID_VP8) {
        av_log(avctx, AV_LOG_ERROR, "Transparency encoding with auto_alt_ref does not work\n");
        return AVERROR(EINVAL);
    }

    if (ctx->sharpness >= 0)
        codecctl_int(avctx, VP8E_SET_SHARPNESS, ctx->sharpness);

    if (CONFIG_LIBVPX_VP8_ENCODER && avctx->codec_id == AV_CODEC_ID_VP8) {
#if FF_API_PRIVATE_OPT
FF_DISABLE_DEPRECATION_WARNINGS
        if (avctx->noise_reduction)
            ctx->noise_sensitivity = avctx->noise_reduction;
FF_ENABLE_DEPRECATION_WARNINGS
#endif
        codecctl_int(avctx, VP8E_SET_NOISE_SENSITIVITY, ctx->noise_sensitivity);
        codecctl_int(avctx, VP8E_SET_TOKEN_PARTITIONS,  av_log2(avctx->slices));
    }
    codecctl_int(avctx, VP8E_SET_STATIC_THRESHOLD,  ctx->static_thresh);
    if (ctx->crf >= 0)
        codecctl_int(avctx, VP8E_SET_CQ_LEVEL,          ctx->crf);
    if (ctx->max_intra_rate >= 0)
        codecctl_int(avctx, VP8E_SET_MAX_INTRA_BITRATE_PCT, ctx->max_intra_rate);

#if CONFIG_LIBVPX_VP9_ENCODER
    if (avctx->codec_id == AV_CODEC_ID_VP9) {
        if (ctx->lossless >= 0)
            codecctl_int(avctx, VP9E_SET_LOSSLESS, ctx->lossless);
        if (ctx->tile_columns >= 0)
            codecctl_int(avctx, VP9E_SET_TILE_COLUMNS, ctx->tile_columns);
        if (ctx->tile_rows >= 0)
            codecctl_int(avctx, VP9E_SET_TILE_ROWS, ctx->tile_rows);
        if (ctx->frame_parallel >= 0)
            codecctl_int(avctx, VP9E_SET_FRAME_PARALLEL_DECODING, ctx->frame_parallel);
        if (ctx->aq_mode >= 0)
            codecctl_int(avctx, VP9E_SET_AQ_MODE, ctx->aq_mode);
        set_colorspace(avctx);
#if VPX_ENCODER_ABI_VERSION >= 11
        set_color_range(avctx);
#endif
#if VPX_ENCODER_ABI_VERSION >= 12
        codecctl_int(avctx, VP9E_SET_TARGET_LEVEL, ctx->level < 0 ? 255 : lrint(ctx->level * 10));
#endif
#ifdef VPX_CTRL_VP9E_SET_ROW_MT
        if (ctx->row_mt >= 0)
            codecctl_int(avctx, VP9E_SET_ROW_MT, ctx->row_mt);
#endif
#ifdef VPX_CTRL_VP9E_SET_TUNE_CONTENT
        if (ctx->tune_content >= 0)
            codecctl_int(avctx, VP9E_SET_TUNE_CONTENT, ctx->tune_content);
#endif
#ifdef VPX_CTRL_VP9E_SET_TPL
        if (ctx->tpl_model >= 0)
            codecctl_int(avctx, VP9E_SET_TPL, ctx->tpl_model);
#endif
    }
#endif

    av_log(avctx, AV_LOG_DEBUG, "Using deadline: %d\n", ctx->deadline);

    //provide dummy value to initialize wrapper, values will be updated each _encode()
    vpx_img_wrap(&ctx->rawimg, img_fmt, avctx->width, avctx->height, 1,
                 (unsigned char*)1);
#if CONFIG_LIBVPX_VP9_ENCODER
    if (avctx->codec_id == AV_CODEC_ID_VP9 && (codec_caps & VPX_CODEC_CAP_HIGHBITDEPTH))
        ctx->rawimg.bit_depth = enccfg.g_bit_depth;
#endif

    cpb_props = ff_add_cpb_side_data(avctx);
    if (!cpb_props)
        return AVERROR(ENOMEM);

    if (enccfg.rc_end_usage == VPX_CBR ||
        enccfg.g_pass != VPX_RC_ONE_PASS) {
        cpb_props->max_bitrate = avctx->rc_max_rate;
        cpb_props->min_bitrate = avctx->rc_min_rate;
        cpb_props->avg_bitrate = avctx->bit_rate;
    }
    cpb_props->buffer_size = avctx->rc_buffer_size;

    return 0;
}

static inline void cx_pktcpy(struct FrameListData *dst,
                             const struct vpx_codec_cx_pkt *src,
                             const struct vpx_codec_cx_pkt *src_alpha,
                             VPxContext *ctx)
{
    dst->pts      = src->data.frame.pts;
    dst->duration = src->data.frame.duration;
    dst->flags    = src->data.frame.flags;
    dst->sz       = src->data.frame.sz;
    dst->buf      = src->data.frame.buf;
    dst->have_sse = 0;
    /* For alt-ref frame, don't store PSNR or increment frame_number */
    if (!(dst->flags & VPX_FRAME_IS_INVISIBLE)) {
        dst->frame_number = ++ctx->frame_number;
        dst->have_sse = ctx->have_sse;
        if (ctx->have_sse) {
            /* associate last-seen SSE to the frame. */
            /* Transfers ownership from ctx to dst. */
            /* WARNING! This makes the assumption that PSNR_PKT comes
               just before the frame it refers to! */
            memcpy(dst->sse, ctx->sse, sizeof(dst->sse));
            ctx->have_sse = 0;
        }
    } else {
        dst->frame_number = -1;   /* sanity marker */
    }
    if (src_alpha) {
        dst->buf_alpha = src_alpha->data.frame.buf;
        dst->sz_alpha = src_alpha->data.frame.sz;
    } else {
        dst->buf_alpha = NULL;
        dst->sz_alpha = 0;
    }
}

/**
 * Store coded frame information in format suitable for return from encode2().
 *
 * Write information from @a cx_frame to @a pkt
 * @return packet data size on success
 * @return a negative AVERROR on error
 */
static int storeframe(AVCodecContext *avctx, struct FrameListData *cx_frame,
                      AVPacket *pkt)
{
    int ret = ff_alloc_packet2(avctx, pkt, cx_frame->sz, 0);
    uint8_t *side_data;
    if (ret >= 0) {
        int pict_type;
        memcpy(pkt->data, cx_frame->buf, pkt->size);
        pkt->pts = pkt->dts = cx_frame->pts;
#if FF_API_CODED_FRAME
FF_DISABLE_DEPRECATION_WARNINGS
        avctx->coded_frame->pts       = cx_frame->pts;
        avctx->coded_frame->key_frame = !!(cx_frame->flags & VPX_FRAME_IS_KEY);
FF_ENABLE_DEPRECATION_WARNINGS
#endif

        if (!!(cx_frame->flags & VPX_FRAME_IS_KEY)) {
            pict_type = AV_PICTURE_TYPE_I;
#if FF_API_CODED_FRAME
FF_DISABLE_DEPRECATION_WARNINGS
            avctx->coded_frame->pict_type = pict_type;
FF_ENABLE_DEPRECATION_WARNINGS
#endif
            pkt->flags |= AV_PKT_FLAG_KEY;
        } else {
            pict_type = AV_PICTURE_TYPE_P;
#if FF_API_CODED_FRAME
FF_DISABLE_DEPRECATION_WARNINGS
            avctx->coded_frame->pict_type = pict_type;
FF_ENABLE_DEPRECATION_WARNINGS
#endif
        }

        ff_side_data_set_encoder_stats(pkt, 0, cx_frame->sse + 1,
                                       cx_frame->have_sse ? 3 : 0, pict_type);

        if (cx_frame->have_sse) {
            int i;
            /* Beware of the Y/U/V/all order! */
#if FF_API_CODED_FRAME
FF_DISABLE_DEPRECATION_WARNINGS
            avctx->coded_frame->error[0] = cx_frame->sse[1];
            avctx->coded_frame->error[1] = cx_frame->sse[2];
            avctx->coded_frame->error[2] = cx_frame->sse[3];
            avctx->coded_frame->error[3] = 0;    // alpha
FF_ENABLE_DEPRECATION_WARNINGS
#endif
            for (i = 0; i < 3; ++i) {
                avctx->error[i] += cx_frame->sse[i + 1];
            }
            cx_frame->have_sse = 0;
        }
        if (cx_frame->sz_alpha > 0) {
            side_data = av_packet_new_side_data(pkt,
                                                AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,
                                                cx_frame->sz_alpha + 8);
            if(!side_data) {
                av_packet_unref(pkt);
                return AVERROR(ENOMEM);
            }
            AV_WB64(side_data, 1);
            memcpy(side_data + 8, cx_frame->buf_alpha, cx_frame->sz_alpha);
        }
    } else {
        return ret;
    }
    return pkt->size;
}

/**
 * Queue multiple output frames from the encoder, returning the front-most.
 * In cases where vpx_codec_get_cx_data() returns more than 1 frame append
 * the frame queue. Return the head frame if available.
 * @return Stored frame size
 * @return AVERROR(EINVAL) on output size error
 * @return AVERROR(ENOMEM) on coded frame queue data allocation error
 */
static int queue_frames(AVCodecContext *avctx, AVPacket *pkt_out)
{
    VPxContext *ctx = avctx->priv_data;
    const struct vpx_codec_cx_pkt *pkt;
    const struct vpx_codec_cx_pkt *pkt_alpha = NULL;
    const void *iter = NULL;
    const void *iter_alpha = NULL;
    int size = 0;

    if (ctx->coded_frame_list) {
        struct FrameListData *cx_frame = ctx->coded_frame_list;
        /* return the leading frame if we've already begun queueing */
        size = storeframe(avctx, cx_frame, pkt_out);
        if (size < 0)
            return size;
        ctx->coded_frame_list = cx_frame->next;
        free_coded_frame(cx_frame);
    }

    /* consume all available output from the encoder before returning. buffers
       are only good through the next vpx_codec call */
    while ((pkt = vpx_codec_get_cx_data(&ctx->encoder, &iter)) &&
           (!ctx->is_alpha ||
            (pkt_alpha = vpx_codec_get_cx_data(&ctx->encoder_alpha, &iter_alpha)))) {
        switch (pkt->kind) {
        case VPX_CODEC_CX_FRAME_PKT:
            if (!size) {
                struct FrameListData cx_frame;

                /* avoid storing the frame when the list is empty and we haven't yet
                   provided a frame for output */
                av_assert0(!ctx->coded_frame_list);
                cx_pktcpy(&cx_frame, pkt, pkt_alpha, ctx);
                size = storeframe(avctx, &cx_frame, pkt_out);
                if (size < 0)
                    return size;
            } else {
                struct FrameListData *cx_frame = av_malloc(sizeof(*cx_frame));

                if (!cx_frame) {
                    av_log(avctx, AV_LOG_ERROR,
                           "Frame queue element alloc failed\n");
                    return AVERROR(ENOMEM);
                }
                cx_pktcpy(cx_frame, pkt, pkt_alpha, ctx);
                cx_frame->buf = av_malloc(cx_frame->sz);

                if (!cx_frame->buf) {
                    av_log(avctx, AV_LOG_ERROR,
                           "Data buffer alloc (%"SIZE_SPECIFIER" bytes) failed\n",
                           cx_frame->sz);
                    av_freep(&cx_frame);
                    return AVERROR(ENOMEM);
                }
                memcpy(cx_frame->buf, pkt->data.frame.buf, pkt->data.frame.sz);
                if (ctx->is_alpha) {
                    cx_frame->buf_alpha = av_malloc(cx_frame->sz_alpha);
                    if (!cx_frame->buf_alpha) {
                        av_log(avctx, AV_LOG_ERROR,
                               "Data buffer alloc (%"SIZE_SPECIFIER" bytes) failed\n",
                               cx_frame->sz_alpha);
                        av_free(cx_frame);
                        return AVERROR(ENOMEM);
                    }
                    memcpy(cx_frame->buf_alpha, pkt_alpha->data.frame.buf, pkt_alpha->data.frame.sz);
                }
                coded_frame_add(&ctx->coded_frame_list, cx_frame);
            }
            break;
        case VPX_CODEC_STATS_PKT: {
            struct vpx_fixed_buf *stats = &ctx->twopass_stats;
            int err;
            if ((err = av_reallocp(&stats->buf,
                                   stats->sz +
                                   pkt->data.twopass_stats.sz)) < 0) {
                stats->sz = 0;
                av_log(avctx, AV_LOG_ERROR, "Stat buffer realloc failed\n");
                return err;
            }
            memcpy((uint8_t*)stats->buf + stats->sz,
                   pkt->data.twopass_stats.buf, pkt->data.twopass_stats.sz);
            stats->sz += pkt->data.twopass_stats.sz;
            break;
        }
        case VPX_CODEC_PSNR_PKT:
            av_assert0(!ctx->have_sse);
            ctx->sse[0] = pkt->data.psnr.sse[0];
            ctx->sse[1] = pkt->data.psnr.sse[1];
            ctx->sse[2] = pkt->data.psnr.sse[2];
            ctx->sse[3] = pkt->data.psnr.sse[3];
            ctx->have_sse = 1;
            break;
        case VPX_CODEC_CUSTOM_PKT:
            //ignore unsupported/unrecognized packet types
            break;
        }
    }

    return size;
}

static int set_roi_map(AVCodecContext *avctx, const AVFrameSideData *sd, int frame_width, int frame_height,
                       vpx_roi_map_t *roi_map, int block_size, int segment_cnt)
{
    /**
     * range of vpx_roi_map_t.delta_q[i] is [-63, 63]
     */
#define MAX_DELTA_Q 63

    const AVRegionOfInterest *roi = NULL;
    int nb_rois;
    uint32_t self_size;
    int segment_id;

    /* record the mapping from delta_q to "segment id + 1" in segment_mapping[].
     * the range of delta_q is [-MAX_DELTA_Q, MAX_DELTA_Q],
     * and its corresponding array index is [0, 2 * MAX_DELTA_Q],
     * and so the length of the mapping array is 2 * MAX_DELTA_Q + 1.
     * "segment id + 1", so we can say there's no mapping if the value of array element is zero.
     */
    int segment_mapping[2 * MAX_DELTA_Q + 1] = { 0 };

    memset(roi_map, 0, sizeof(*roi_map));

    /* segment id 0 in roi_map is reserved for the areas not covered by AVRegionOfInterest.
     * segment id 0 in roi_map is also for the areas with AVRegionOfInterest.qoffset near 0.
     * (delta_q of segment id 0 is 0).
     */
    segment_mapping[MAX_DELTA_Q] = 1;
    segment_id = 1;

    roi = (const AVRegionOfInterest*)sd->data;
    self_size = roi->self_size;
    if (!self_size || sd->size % self_size) {
        av_log(avctx, AV_LOG_ERROR, "Invalid AVRegionOfInterest.self_size.\n");
        return AVERROR(EINVAL);
    }
    nb_rois = sd->size / self_size;

    /* This list must be iterated from zero because regions are
     * defined in order of decreasing importance. So discard less
     * important areas if they exceed the segment count.
     */
    for (int i = 0; i < nb_rois; i++) {
        int delta_q;
        int mapping_index;

        roi = (const AVRegionOfInterest*)(sd->data + self_size * i);
        if (!roi->qoffset.den) {
            av_log(avctx, AV_LOG_ERROR, "AVRegionOfInterest.qoffset.den must not be zero.\n");
            return AVERROR(EINVAL);
        }

        delta_q = (int)(roi->qoffset.num * 1.0f / roi->qoffset.den * MAX_DELTA_Q);
        delta_q = av_clip(delta_q, -MAX_DELTA_Q, MAX_DELTA_Q);

        mapping_index = delta_q + MAX_DELTA_Q;
        if (!segment_mapping[mapping_index]) {
            if (segment_id == segment_cnt) {
                av_log(avctx, AV_LOG_WARNING,
                       "ROI only supports %d segments (and segment 0 is reserved for non-ROIs), skipping the left ones.\n",
                       segment_cnt);
                break;
            }

            segment_mapping[mapping_index] = segment_id + 1;
            roi_map->delta_q[segment_id] = delta_q;
            segment_id++;
        }
    }

    roi_map->rows = (frame_height + block_size - 1) / block_size;
    roi_map->cols = (frame_width  + block_size - 1) / block_size;
    roi_map->roi_map = av_mallocz_array(roi_map->rows * roi_map->cols, sizeof(*roi_map->roi_map));
    if (!roi_map->roi_map) {
        av_log(avctx, AV_LOG_ERROR, "roi_map alloc failed.\n");
        return AVERROR(ENOMEM);
    }

    /* This list must be iterated in reverse, so for the case that
     * two regions are overlapping, the more important area takes effect.
     */
    for (int i = nb_rois - 1; i >= 0; i--) {
        int delta_q;
        int mapping_value;
        int starty, endy, startx, endx;

        roi = (const AVRegionOfInterest*)(sd->data + self_size * i);

        starty = av_clip(roi->top / block_size, 0, roi_map->rows);
        endy   = av_clip((roi->bottom + block_size - 1) / block_size, 0, roi_map->rows);
        startx = av_clip(roi->left / block_size, 0, roi_map->cols);
        endx   = av_clip((roi->right + block_size - 1) / block_size, 0, roi_map->cols);

        delta_q = (int)(roi->qoffset.num * 1.0f / roi->qoffset.den * MAX_DELTA_Q);
        delta_q = av_clip(delta_q, -MAX_DELTA_Q, MAX_DELTA_Q);

        mapping_value = segment_mapping[delta_q + MAX_DELTA_Q];
        if (mapping_value) {
            for (int y = starty; y < endy; y++)
                for (int x = startx; x < endx; x++)
                    roi_map->roi_map[x + y * roi_map->cols] = mapping_value - 1;
        }
    }

    return 0;
}

static int vp9_encode_set_roi(AVCodecContext *avctx, int frame_width, int frame_height, const AVFrameSideData *sd)
{
    VPxContext *ctx = avctx->priv_data;

#ifdef VPX_CTRL_VP9E_SET_ROI_MAP
    int version = vpx_codec_version();
    int major = VPX_VERSION_MAJOR(version);
    int minor = VPX_VERSION_MINOR(version);
    int patch = VPX_VERSION_PATCH(version);

    if (major > 1 || (major == 1 && minor > 8) || (major == 1 && minor == 8 && patch >= 1)) {
        vpx_roi_map_t roi_map;
        const int segment_cnt = 8;
        const int block_size = 8;
        int ret;

        if (ctx->aq_mode > 0 || ctx->cpu_used < 5 || ctx->deadline != VPX_DL_REALTIME) {
            if (!ctx->roi_warned) {
                ctx->roi_warned = 1;
                av_log(avctx, AV_LOG_WARNING, "ROI is only enabled when aq_mode is 0, cpu_used >= 5 "
                                              "and deadline is REALTIME, so skipping ROI.\n");
                return AVERROR(EINVAL);
            }
        }

        ret = set_roi_map(avctx, sd, frame_width, frame_height, &roi_map, block_size, segment_cnt);
        if (ret) {
            log_encoder_error(avctx, "Failed to set_roi_map.\n");
            return ret;
        }

        memset(roi_map.ref_frame, -1, sizeof(roi_map.ref_frame));

        if (vpx_codec_control(&ctx->encoder, VP9E_SET_ROI_MAP, &roi_map)) {
            log_encoder_error(avctx, "Failed to set VP9E_SET_ROI_MAP codec control.\n");
            ret = AVERROR_INVALIDDATA;
        }
        av_freep(&roi_map.roi_map);
        return ret;
    }
#endif

    if (!ctx->roi_warned) {
        ctx->roi_warned = 1;
        av_log(avctx, AV_LOG_WARNING, "ROI is not supported, please upgrade libvpx to version >= 1.8.1. "
                                      "You may need to rebuild ffmpeg.\n");
    }
    return 0;
}

static int vp8_encode_set_roi(AVCodecContext *avctx, int frame_width, int frame_height, const AVFrameSideData *sd)
{
    vpx_roi_map_t roi_map;
    const int segment_cnt = 4;
    const int block_size = 16;
    VPxContext *ctx = avctx->priv_data;

    int ret = set_roi_map(avctx, sd, frame_width, frame_height, &roi_map, block_size, segment_cnt);
    if (ret) {
        log_encoder_error(avctx, "Failed to set_roi_map.\n");
        return ret;
    }

    if (vpx_codec_control(&ctx->encoder, VP8E_SET_ROI_MAP, &roi_map)) {
        log_encoder_error(avctx, "Failed to set VP8E_SET_ROI_MAP codec control.\n");
        ret = AVERROR_INVALIDDATA;
    }

    av_freep(&roi_map.roi_map);
    return ret;
}

static int realloc_alpha_uv(AVCodecContext *avctx, int width, int height)
{
    VPxContext *ctx = avctx->priv_data;
    struct vpx_image *rawimg_alpha = &ctx->rawimg_alpha;
    unsigned char **planes = rawimg_alpha->planes;
    int *stride = rawimg_alpha->stride;

    if (!planes[VPX_PLANE_U] ||
        !planes[VPX_PLANE_V] ||
        width  != (int)rawimg_alpha->d_w ||
        height != (int)rawimg_alpha->d_h) {
        av_freep(&planes[VPX_PLANE_U]);
        av_freep(&planes[VPX_PLANE_V]);

        vpx_img_wrap(rawimg_alpha, VPX_IMG_FMT_I420, width, height, 1,
                     (unsigned char*)1);
        planes[VPX_PLANE_U] = av_malloc_array(stride[VPX_PLANE_U], height);
        planes[VPX_PLANE_V] = av_malloc_array(stride[VPX_PLANE_V], height);
        if (!planes[VPX_PLANE_U] || !planes[VPX_PLANE_V])
            return AVERROR(ENOMEM);

        memset(planes[VPX_PLANE_U], 0x80, stride[VPX_PLANE_U] * height);
        memset(planes[VPX_PLANE_V], 0x80, stride[VPX_PLANE_V] * height);
    }

    return 0;
}

static int vpx_encode(AVCodecContext *avctx, AVPacket *pkt,
                      const AVFrame *frame, int *got_packet)
{
    VPxContext *ctx = avctx->priv_data;
    struct vpx_image *rawimg = NULL;
    struct vpx_image *rawimg_alpha = NULL;
    int64_t timestamp = 0;
    int res, coded_size;
    vpx_enc_frame_flags_t flags = 0;
    const struct vpx_codec_enc_cfg *enccfg = ctx->encoder.config.enc;
    vpx_svc_layer_id_t layer_id;
    int layer_id_valid = 0;

    if (frame) {
        const AVFrameSideData *sd = av_frame_get_side_data(frame, AV_FRAME_DATA_REGIONS_OF_INTEREST);
        rawimg                      = &ctx->rawimg;
        rawimg->planes[VPX_PLANE_Y] = frame->data[0];
        rawimg->planes[VPX_PLANE_U] = frame->data[1];
        rawimg->planes[VPX_PLANE_V] = frame->data[2];
        rawimg->stride[VPX_PLANE_Y] = frame->linesize[0];
        rawimg->stride[VPX_PLANE_U] = frame->linesize[1];
        rawimg->stride[VPX_PLANE_V] = frame->linesize[2];
        if (ctx->is_alpha) {
            rawimg_alpha = &ctx->rawimg_alpha;
            res = realloc_alpha_uv(avctx, frame->width, frame->height);
            if (res < 0)
                return res;
            rawimg_alpha->planes[VPX_PLANE_Y] = frame->data[3];
            rawimg_alpha->stride[VPX_PLANE_Y] = frame->linesize[3];
        }
        timestamp                   = frame->pts;
#if VPX_IMAGE_ABI_VERSION >= 4
        switch (frame->color_range) {
        case AVCOL_RANGE_MPEG:
            rawimg->range = VPX_CR_STUDIO_RANGE;
            break;
        case AVCOL_RANGE_JPEG:
            rawimg->range = VPX_CR_FULL_RANGE;
            break;
        }
#endif
        if (frame->pict_type == AV_PICTURE_TYPE_I)
            flags |= VPX_EFLAG_FORCE_KF;
        if (frame->metadata) {
            AVDictionaryEntry* en = av_dict_get(frame->metadata, "vp8-flags", NULL, 0);
            if (en) {
                flags |= strtoul(en->value, NULL, 10);
            }

            memset(&layer_id, 0, sizeof(layer_id));

            en = av_dict_get(frame->metadata, "temporal_id", NULL, 0);
            if (en) {
                layer_id.temporal_layer_id = strtoul(en->value, NULL, 10);
#ifdef VPX_CTRL_VP9E_SET_MAX_INTER_BITRATE_PCT
                layer_id.temporal_layer_id_per_spatial[0] = layer_id.temporal_layer_id;
#endif
                layer_id_valid = 1;
            }
        }

        if (sd) {
            if (avctx->codec_id == AV_CODEC_ID_VP8) {
                vp8_encode_set_roi(avctx, frame->width, frame->height, sd);
            } else {
                vp9_encode_set_roi(avctx, frame->width, frame->height, sd);
            }
        }
    }

    // this is for encoding with preset temporal layering patterns defined in
    // set_temporal_layer_pattern function.
    if (enccfg->ts_number_layers > 1 && ctx->ts_layer_flags) {
        if (flags & VPX_EFLAG_FORCE_KF) {
            // keyframe, reset temporal layering.
            ctx->current_temporal_idx = 0;
            flags = VPX_EFLAG_FORCE_KF;
        } else {
            flags = 0;
        }

        /* get the flags from the temporal layer configuration. */
        flags |= ctx->ts_layer_flags[ctx->current_temporal_idx];

        memset(&layer_id, 0, sizeof(layer_id));
#if VPX_ENCODER_ABI_VERSION >= 12
        layer_id.spatial_layer_id = 0;
#endif
        layer_id.temporal_layer_id = enccfg->ts_layer_id[ctx->current_temporal_idx];
#ifdef VPX_CTRL_VP9E_SET_MAX_INTER_BITRATE_PCT
        layer_id.temporal_layer_id_per_spatial[0] = layer_id.temporal_layer_id;
#endif
        layer_id_valid = 1;
    }

    if (layer_id_valid) {
        if (avctx->codec_id == AV_CODEC_ID_VP8) {
            codecctl_int(avctx, VP8E_SET_TEMPORAL_LAYER_ID, layer_id.temporal_layer_id);
        }
#if CONFIG_LIBVPX_VP9_ENCODER && VPX_ENCODER_ABI_VERSION >= 12
        else if (avctx->codec_id == AV_CODEC_ID_VP9) {
            codecctl_intp(avctx, VP9E_SET_SVC_LAYER_ID, (int *)&layer_id);
        }
#endif
    }

    res = vpx_codec_encode(&ctx->encoder, rawimg, timestamp,
                           avctx->ticks_per_frame, flags, ctx->deadline);
    if (res != VPX_CODEC_OK) {
        log_encoder_error(avctx, "Error encoding frame");
        return AVERROR_INVALIDDATA;
    }

    if (ctx->is_alpha) {
        res = vpx_codec_encode(&ctx->encoder_alpha, rawimg_alpha, timestamp,
                               avctx->ticks_per_frame, flags, ctx->deadline);
        if (res != VPX_CODEC_OK) {
            log_encoder_error(avctx, "Error encoding alpha frame");
            return AVERROR_INVALIDDATA;
        }
    }

    coded_size = queue_frames(avctx, pkt);

    if (!frame && avctx->flags & AV_CODEC_FLAG_PASS1) {
        unsigned int b64_size = AV_BASE64_SIZE(ctx->twopass_stats.sz);

        avctx->stats_out = av_malloc(b64_size);
        if (!avctx->stats_out) {
            av_log(avctx, AV_LOG_ERROR, "Stat buffer alloc (%d bytes) failed\n",
                   b64_size);
            return AVERROR(ENOMEM);
        }
        av_base64_encode(avctx->stats_out, b64_size, ctx->twopass_stats.buf,
                         ctx->twopass_stats.sz);
    } else if (enccfg->ts_number_layers > 1 && ctx->ts_layer_flags) {
        ctx->current_temporal_idx = (ctx->current_temporal_idx + 1) % enccfg->ts_periodicity;
    }

    *got_packet = !!coded_size;
    return 0;
}

#define OFFSET(x) offsetof(VPxContext, x)
#define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM

#define COMMON_OPTIONS \
    { "lag-in-frames",   "Number of frames to look ahead for " \
                         "alternate reference frame selection",    OFFSET(lag_in_frames),   AV_OPT_TYPE_INT, {.i64 = -1},      -1,      INT_MAX, VE}, \
    { "arnr-maxframes",  "altref noise reduction max frame count", OFFSET(arnr_max_frames), AV_OPT_TYPE_INT, {.i64 = -1},      -1,      INT_MAX, VE}, \
    { "arnr-strength",   "altref noise reduction filter strength", OFFSET(arnr_strength),   AV_OPT_TYPE_INT, {.i64 = -1},      -1,      INT_MAX, VE}, \
    { "arnr-type",       "altref noise reduction filter type",     OFFSET(arnr_type),       AV_OPT_TYPE_INT, {.i64 = -1},      -1,      INT_MAX, VE, "arnr_type"}, \
    { "backward",        NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 1}, 0, 0, VE, "arnr_type" }, \
    { "forward",         NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 2}, 0, 0, VE, "arnr_type" }, \
    { "centered",        NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 3}, 0, 0, VE, "arnr_type" }, \
    { "tune",            "Tune the encoding to a specific scenario", OFFSET(tune),          AV_OPT_TYPE_INT, {.i64 = -1},      -1,      INT_MAX, VE, "tune"}, \
    { "psnr",            NULL, 0, AV_OPT_TYPE_CONST, {.i64 = VP8_TUNE_PSNR}, 0, 0, VE, "tune"}, \
    { "ssim",            NULL, 0, AV_OPT_TYPE_CONST, {.i64 = VP8_TUNE_SSIM}, 0, 0, VE, "tune"}, \
    { "deadline",        "Time to spend encoding, in microseconds.", OFFSET(deadline),      AV_OPT_TYPE_INT, {.i64 = VPX_DL_GOOD_QUALITY}, INT_MIN, INT_MAX, VE, "quality"}, \
    { "best",            NULL, 0, AV_OPT_TYPE_CONST, {.i64 = VPX_DL_BEST_QUALITY}, 0, 0, VE, "quality"}, \
    { "good",            NULL, 0, AV_OPT_TYPE_CONST, {.i64 = VPX_DL_GOOD_QUALITY}, 0, 0, VE, "quality"}, \
    { "realtime",        NULL, 0, AV_OPT_TYPE_CONST, {.i64 = VPX_DL_REALTIME},     0, 0, VE, "quality"}, \
    { "error-resilient", "Error resilience configuration", OFFSET(error_resilient), AV_OPT_TYPE_FLAGS, {.i64 = 0}, INT_MIN, INT_MAX, VE, "er"}, \
    { "max-intra-rate",  "Maximum I-frame bitrate (pct) 0=unlimited",  OFFSET(max_intra_rate),  AV_OPT_TYPE_INT,  {.i64 = -1}, -1,      INT_MAX, VE}, \
    { "default",         "Improve resiliency against losses of whole frames", 0, AV_OPT_TYPE_CONST, {.i64 = VPX_ERROR_RESILIENT_DEFAULT}, 0, 0, VE, "er"}, \
    { "partitions",      "The frame partitions are independently decodable " \
                         "by the bool decoder, meaning that partitions can be decoded even " \
                         "though earlier partitions have been lost. Note that intra prediction" \
                         " is still done over the partition boundary.",       0, AV_OPT_TYPE_CONST, {.i64 = VPX_ERROR_RESILIENT_PARTITIONS}, 0, 0, VE, "er"}, \
    { "crf",              "Select the quality for constant quality mode", offsetof(VPxContext, crf), AV_OPT_TYPE_INT, {.i64 = -1}, -1, 63, VE }, \
    { "static-thresh",    "A change threshold on blocks below which they will be skipped by the encoder", OFFSET(static_thresh), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, VE }, \
    { "drop-threshold",   "Frame drop threshold", offsetof(VPxContext, drop_threshold), AV_OPT_TYPE_INT, {.i64 = 0 }, INT_MIN, INT_MAX, VE }, \
    { "noise-sensitivity", "Noise sensitivity", OFFSET(noise_sensitivity), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, 4, VE}, \
    { "undershoot-pct",  "Datarate undershoot (min) target (%)", OFFSET(rc_undershoot_pct), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 100, VE }, \
    { "overshoot-pct",   "Datarate overshoot (max) target (%)", OFFSET(rc_overshoot_pct), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 1000, VE }, \
    { "ts-parameters",   "Temporal scaling configuration using a :-separated list of key=value parameters", OFFSET(vpx_ts_parameters), AV_OPT_TYPE_DICT, {.str=NULL},  0,  0, VE}, \

#define LEGACY_OPTIONS \
    {"speed", "", offsetof(VPxContext, cpu_used), AV_OPT_TYPE_INT, {.i64 = 1}, -16, 16, VE}, \
    {"quality", "", offsetof(VPxContext, deadline), AV_OPT_TYPE_INT, {.i64 = VPX_DL_GOOD_QUALITY}, INT_MIN, INT_MAX, VE, "quality"}, \
    {"vp8flags", "", offsetof(VPxContext, flags), AV_OPT_TYPE_FLAGS, {.i64 = 0}, 0, UINT_MAX, VE, "flags"}, \
    {"error_resilient", "enable error resilience", 0, AV_OPT_TYPE_CONST, {.i64 = VP8F_ERROR_RESILIENT}, INT_MIN, INT_MAX, VE, "flags"}, \
    {"altref", "enable use of alternate reference frames (VP8/2-pass only)", 0, AV_OPT_TYPE_CONST, {.i64 = VP8F_AUTO_ALT_REF}, INT_MIN, INT_MAX, VE, "flags"}, \
    {"arnr_max_frames", "altref noise reduction max frame count", offsetof(VPxContext, arnr_max_frames), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 15, VE}, \
    {"arnr_strength", "altref noise reduction filter strength", offsetof(VPxContext, arnr_strength), AV_OPT_TYPE_INT, {.i64 = 3}, 0, 6, VE}, \
    {"arnr_type", "altref noise reduction filter type", offsetof(VPxContext, arnr_type), AV_OPT_TYPE_INT, {.i64 = 3}, 1, 3, VE}, \
    {"rc_lookahead", "Number of frames to look ahead for alternate reference frame selection", offsetof(VPxContext, lag_in_frames), AV_OPT_TYPE_INT, {.i64 = 25}, 0, 25, VE}, \
    {"sharpness", "Increase sharpness at the expense of lower PSNR", offsetof(VPxContext, sharpness), AV_OPT_TYPE_INT, {.i64 = -1}, -1, 7, VE},

#if CONFIG_LIBVPX_VP8_ENCODER
static const AVOption vp8_options[] = {
    COMMON_OPTIONS
    { "auto-alt-ref",    "Enable use of alternate reference "
                         "frames (2-pass only)",                        OFFSET(auto_alt_ref),    AV_OPT_TYPE_INT, {.i64 = -1}, -1,  2, VE},
    { "cpu-used",        "Quality/Speed ratio modifier",                OFFSET(cpu_used),        AV_OPT_TYPE_INT, {.i64 = 1}, -16, 16, VE},
    LEGACY_OPTIONS
    { NULL }
};
#endif

#if CONFIG_LIBVPX_VP9_ENCODER
static const AVOption vp9_options[] = {
    COMMON_OPTIONS
    { "auto-alt-ref",    "Enable use of alternate reference "
                         "frames (2-pass only)",                        OFFSET(auto_alt_ref),    AV_OPT_TYPE_INT, {.i64 = -1}, -1, 6, VE},
    { "cpu-used",        "Quality/Speed ratio modifier",                OFFSET(cpu_used),        AV_OPT_TYPE_INT, {.i64 = 1},  -8, 8, VE},
    { "lossless",        "Lossless mode",                               OFFSET(lossless),        AV_OPT_TYPE_INT, {.i64 = -1}, -1, 1, VE},
    { "tile-columns",    "Number of tile columns to use, log2",         OFFSET(tile_columns),    AV_OPT_TYPE_INT, {.i64 = -1}, -1, 6, VE},
    { "tile-rows",       "Number of tile rows to use, log2",            OFFSET(tile_rows),       AV_OPT_TYPE_INT, {.i64 = -1}, -1, 2, VE},
    { "frame-parallel",  "Enable frame parallel decodability features", OFFSET(frame_parallel),  AV_OPT_TYPE_BOOL,{.i64 = -1}, -1, 1, VE},
#if VPX_ENCODER_ABI_VERSION >= 12
    { "aq-mode",         "adaptive quantization mode",                  OFFSET(aq_mode),         AV_OPT_TYPE_INT, {.i64 = -1}, -1, 4, VE, "aq_mode"},
#else
    { "aq-mode",         "adaptive quantization mode",                  OFFSET(aq_mode),         AV_OPT_TYPE_INT, {.i64 = -1}, -1, 3, VE, "aq_mode"},
#endif
    { "none",            "Aq not used",         0, AV_OPT_TYPE_CONST, {.i64 = 0}, 0, 0, VE, "aq_mode" },
    { "variance",        "Variance based Aq",   0, AV_OPT_TYPE_CONST, {.i64 = 1}, 0, 0, VE, "aq_mode" },
    { "complexity",      "Complexity based Aq", 0, AV_OPT_TYPE_CONST, {.i64 = 2}, 0, 0, VE, "aq_mode" },
    { "cyclic",          "Cyclic Refresh Aq",   0, AV_OPT_TYPE_CONST, {.i64 = 3}, 0, 0, VE, "aq_mode" },
#if VPX_ENCODER_ABI_VERSION >= 12
    { "equator360",      "360 video Aq",        0, AV_OPT_TYPE_CONST, {.i64 = 4}, 0, 0, VE, "aq_mode" },
    {"level", "Specify level", OFFSET(level), AV_OPT_TYPE_FLOAT, {.dbl=-1}, -1, 6.2, VE},
#endif
#ifdef VPX_CTRL_VP9E_SET_ROW_MT
    {"row-mt", "Row based multi-threading", OFFSET(row_mt), AV_OPT_TYPE_BOOL, {.i64 = -1}, -1, 1, VE},
#endif
#ifdef VPX_CTRL_VP9E_SET_TUNE_CONTENT
#if VPX_ENCODER_ABI_VERSION >= 14
    { "tune-content",    "Tune content type", OFFSET(tune_content), AV_OPT_TYPE_INT, {.i64 = -1}, -1, 2, VE, "tune_content" },
#else
    { "tune-content",    "Tune content type", OFFSET(tune_content), AV_OPT_TYPE_INT, {.i64 = -1}, -1, 1, VE, "tune_content" },
#endif
    { "default",         "Regular video content",                  0, AV_OPT_TYPE_CONST, {.i64 = 0}, 0, 0, VE, "tune_content" },
    { "screen",          "Screen capture content",                 0, AV_OPT_TYPE_CONST, {.i64 = 1}, 0, 0, VE, "tune_content" },
#if VPX_ENCODER_ABI_VERSION >= 14
    { "film",            "Film content; improves grain retention", 0, AV_OPT_TYPE_CONST, {.i64 = 2}, 0, 0, VE, "tune_content" },
#endif
#endif
#if VPX_ENCODER_ABI_VERSION >= 14
    { "corpus-complexity", "corpus vbr complexity midpoint", OFFSET(corpus_complexity), AV_OPT_TYPE_INT, {.i64 = -1}, -1, 10000, VE },
#endif
#ifdef VPX_CTRL_VP9E_SET_TPL
    { "enable-tpl",      "Enable temporal dependency model", OFFSET(tpl_model), AV_OPT_TYPE_BOOL, {.i64 = -1}, -1, 1, VE },
#endif
    LEGACY_OPTIONS
    { NULL }
};
#endif

#undef COMMON_OPTIONS
#undef LEGACY_OPTIONS

static const AVCodecDefault defaults[] = {
    { "b",                 "0" },
    { "qmin",             "-1" },
    { "qmax",             "-1" },
    { "g",                "-1" },
    { "keyint_min",       "-1" },
    { NULL },
};

#if CONFIG_LIBVPX_VP8_ENCODER
static av_cold int vp8_init(AVCodecContext *avctx)
{
    return vpx_init(avctx, vpx_codec_vp8_cx());
}

static const AVClass class_vp8 = {
    .class_name = "libvpx-vp8 encoder",
    .item_name  = av_default_item_name,
    .option     = vp8_options,
    .version    = LIBAVUTIL_VERSION_INT,
};

AVCodec ff_libvpx_vp8_encoder = {
    .name           = "libvpx",
    .long_name      = NULL_IF_CONFIG_SMALL("libvpx VP8"),
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_VP8,
    .priv_data_size = sizeof(VPxContext),
    .init           = vp8_init,
    .encode2        = vpx_encode,
    .close          = vpx_free,
    .capabilities   = AV_CODEC_CAP_DELAY | AV_CODEC_CAP_AUTO_THREADS,
    .pix_fmts       = (const enum AVPixelFormat[]){ AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUVA420P, AV_PIX_FMT_NONE },
    .priv_class     = &class_vp8,
    .defaults       = defaults,
    .wrapper_name   = "libvpx",
};
#endif /* CONFIG_LIBVPX_VP8_ENCODER */

#if CONFIG_LIBVPX_VP9_ENCODER
static av_cold int vp9_init(AVCodecContext *avctx)
{
    return vpx_init(avctx, vpx_codec_vp9_cx());
}

static const AVClass class_vp9 = {
    .class_name = "libvpx-vp9 encoder",
    .item_name  = av_default_item_name,
    .option     = vp9_options,
    .version    = LIBAVUTIL_VERSION_INT,
};

AVCodec ff_libvpx_vp9_encoder = {
    .name           = "libvpx-vp9",
    .long_name      = NULL_IF_CONFIG_SMALL("libvpx VP9"),
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_VP9,
    .priv_data_size = sizeof(VPxContext),
    .init           = vp9_init,
    .encode2        = vpx_encode,
    .close          = vpx_free,
    .capabilities   = AV_CODEC_CAP_DELAY | AV_CODEC_CAP_AUTO_THREADS,
    .profiles       = NULL_IF_CONFIG_SMALL(ff_vp9_profiles),
    .priv_class     = &class_vp9,
    .defaults       = defaults,
    .init_static_data = ff_vp9_init_static,
    .wrapper_name   = "libvpx",
};
#endif /* CONFIG_LIBVPX_VP9_ENCODER */
